The two college students saved the life of a little boy _______ their own. ( 章节：1 难度：4)
- A、at the risk of
- B、at the danger of
- C、in danger of
- D、at the cost of
正确答案:D
答案解析:有
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The two college students saved the life of a little boy _______ their own. ( 章节：1 难度：4)
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